Paypal Error - Pay per view plugin

I might entered the paypal api incorrectly, but I'm not sure where can I find it. I found the one I used here: https://www.paypal-labs.com/apiexplorer/PayPalAPIs

The error I'm getting is:

There was a problem connecting to PayPal to setup your purchase. Please try again.
10002 – Security error – Security header is not valid